Category Archives: 非平衡現象の流体力学

分科会「非平衡現象の流体力学」(第5回)

平成26年度第5回講演会(日本航空宇宙学会関西支部分科会)

日時: 平成26年7月24日(木) 16:10-17:10
場所: 京都大学 桂キャンパスCクラスタ総合研究棟III(C3棟) 3階 b3n03室(航空宇宙工学専攻会議室)
講演: Time Asymptotical Behavior of  Vlasov-Poisson-Boltzmann Equation
Prof. Hailiang Li
(Department of Mathematics, Capital Normal University, China)
要旨: We present the recent analysis of the spectrum and long time decay rates of  Vlasov-Poisson-Boltzmann Equation, and justify the influence of electric field on the distribution of spectrum of linearized  Vlasov-Poisson-Boltzmann Equation near a global Maxwellian. It is joint work with T. Yang and M.-Y. Zhong.

分科会「非平衡現象の流体力学」(第5回)(中止)

平成26年度第5回講演会(日本航空宇宙学会関西支部分科会)(中止)

日時: 平成26年6月30日(月) 15:15-16:15(中止)
場所: 京都大学 桂キャンパスCクラスタ総合研究棟III(C3棟) 3階 b3n03室(航空宇宙工学専攻会議室)
講演: Regularity and singularity of Boltzmann equation with boundary
Dr. Chanwoo Kim
(DPMMS, Centre for Mathematical Sciences, Cambridge University, UK)
要旨: We discuss the singular behavior of Boltzmann solution near the boundary. When the domain is convex we introduce the weight function to control the singularity near the boundary. With this weight function we are able to estimate the first derivatives of Boltzmann solution. We show that, however, second derivatives may not exist up to the boundary.

分科会「非平衡現象の流体力学」(第4回)

平成26年度第4回講演会(日本航空宇宙学会関西支部分科会)

日時: 平成26年4月24日(木) 16:10-17:10
場所: 京都大学 桂キャンパスCクラスタ総合研究棟III(C3棟) 3階 b3n03室(航空宇宙工学専攻会議室)
講演: Direct Numerical Simulation of Multiphase Flows with Volume of Fluid Methods
Prof. Stéphane Zaleski
(Institut Jean Le Rond d’Alembert, Université Pierre et Marie Curie & CNRS, France)
要旨: I will present the numerical issues, the successes and the perspective of direct numerical simulations using the volume of fluid method. The volume of fluid method has the capability of dealing with very complex interfacial and multiphase flow problems, such as bubble columns, high speed atomizing jets or breaking surface waves. Multiphase flow in porous media also offers particular challenges. Investigating these problems requires both a good numerical technique and physical insight, that allows progress to be made in conjunction with experimental investigations. Recently ,efforts have focused on dealing with large density ratio, large surface tension and either small or large Reynolds numbers. Each application has its challenges that I shall discuss.

分科会「非平衡現象の流体力学」(第3回)

平成26年度第3回講演会(日本航空宇宙学会関西支部分科会)

日時: 平成26年4月9日(水) 16:10-17:10
場所: 京都大学 桂キャンパスCクラスタ総合研究棟III(C3棟) 3階 b3n03室(航空宇宙工学専攻会議室)
講演: Multi-dimensional shock waves
Prof. Tai-Ping Liu
(Institute of Mathematics, Academia Sinica, Taiwan & Professor Emeritus, Department f Mathematics, Stanford University, USA)
要旨: Mathematical study of multi-dimensional shock waves in gas dynamics has a long history and remains a difficult subject. We will first give a brief survey of progresses in recent years. We will then present a current attempt on the two-dimensional wave propagation over a Burgers shock.

分科会「非平衡現象の流体力学」(第2回)

平成26年度第2回講演会(日本航空宇宙学会関西支部分科会)

日時: 平成26年3月28日(金) 16:30-17:30
場所: 京都大学 桂キャンパスCクラスタ総合研究棟III(C3棟) 3階 b3n03室(航空宇宙工学専攻会議室)
講演: Wave motion around shock and boundary layers
Prof. Shih-Hsien Yu
(Department of Mathematics, National University of Singapore, Singapore)
要旨: In this talk we will give a survey on the wave motions of the Boltzmann equation. We will give a brief introduction of nonlinear hyperbolic conservation laws and the connection between the Boltzmann equation and gas dynamics. We will highlight the development of the fundamental solution of the Boltzmann equation, particularly the connection to the theory for the hyperbolic equations. Finally, applications of the Green’s function to the study of nonlinear layers for the Boltzmann equation will be presented.

分科会「非平衡現象の流体力学」(第1回)

平成26年度第1回講演会(日本航空宇宙学会関西支部分科会)

日時: 平成26年3月11日(火) 16:10-17:10
場所: 京都大学 桂キャンパスCクラスタ総合研究棟III(C3棟) 3階 b3n03室(航空宇宙工学専攻会議室)
講演: Bose condensates in interaction with excitations – a two component space-dependent model close to equilibrium
Prof. Anne Nouri
(Institut de Mathématiques de Marseille, Aix-Marseille Université, France)
要旨: A model for Bose gases is considered in the so-called ‘high-temperature range’ below the temperature T_c, where Bose-Einstein condensation sets in. The model is of nonlinear two-component type, consisting of a kinetic equation with periodic boundary conditions for the distribution function of a gas of excitations interacting with a Bose condensate, which is described by a Gross-Pitaevskii equation. Results on well-posedness and long time behaviour are proven close to equilibrium.